package com.xuenci.gulimall.cart.interceptor;/*
 *@author:xec
 *@date:2022/5/27  13:42
 */

import com.xuenci.common.constant.AuthServerConstant;
import com.xuenci.common.constant.CartConstant;
import com.xuenci.common.vo.MemberRespVo;
import com.xuenci.gulimall.cart.vo.UserInfoTo;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/*
在执行目标方法之前，判断用户的登录状态。并封装传递给controller目标请求
 */


public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    /**
     * 目标方法执行之前
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();

        HttpSession session = request.getSession();
        MemberRespVo member = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (member!=null){
            // 用户登录
            userInfoTo.setUserId(member.getId());
        }

        Cookie[] cookies = request.getCookies();
        if (cookies!=null&& cookies.length>0){
            for (Cookie cookie : cookies) {
                // user-key
                String name = cookie.getName();
                if (name.equals(CartConstant.TENP_USER_COOKIE_NAME)){
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }
            }
        }
        // 如果没有临时用户一定分配一个临时用户
        if (StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }
        // 目标方法执行之前
        threadLocal.set(userInfoTo);
        return true;
    }

    /**
     * 业务执行之后。分配临时用户，让浏览器保存
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();

        // 判断是否已有临时用户信息，如果没有临时用户一定保存一个临时用户
        if (!userInfoTo.isTempUser()){
            // 持续的延长临时用户的过期时间
            Cookie cookie = new Cookie(CartConstant.TENP_USER_COOKIE_NAME,userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TIME_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
    }
}
